Re: replacing batteries in Norelco shaver
- From: Jim Yanik <jyanik@xxxxxxxxxx>
- Date: 27 Aug 2005 05:04:45 GMT
H. Dziardziel <hdzi@xxxxxxxxxxxxxxx> wrote in
news:s98vg193dgmvltgsvlsmqq90qcif0f7hhl@xxxxxxx:
> On Thu, 25 Aug 2005 18:55:43 -0400, Darmok
><cooncat.spam@xxxxxxxxx> wrote:
>
>>
>
> Charging in only 20 minutes is a 3C charge rate ie, three times
> the cell mAh capacity. Shaver NiCads would be in the 500m-1000Ah
> range. NiMh 2000-2600mAh AAs can handle that 1500-2000mA charge
> rate but must not go over full charge or will be destroyed.
>
> The question is: is that a timed 20 minutes or a "smart" 20
> minutes? If timed and one starts with fully discharged cells
> then all is well. NiMh have no memory effect so can be charged
> and dicharged from-to any level But, if a smart charger is used,
> it may not properly detect the NiMh charge state and keep charging
> past fully charged.
>
> For say, 1500mAh cells, that would take about one hour however so
> manul timing would suffice. Monitoring the cell temperature is a
> good idea. Some heating while charging is normal for NiMh but
> after full charge is reached it quickly ruins the cells.
>
>
According to what I've read here and there,cell temperature is NOT a good
way to detect full charge for NiMH cells. For NiCd,its OK.
By the time the temp changes the NiMH cell is overcharged.
--
Jim Yanik
jyanik
at
kua.net
.
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